Drill-paralleler



W. STARK.

DRILL PARALLELER.

APPLICATION FILED MAY6.1920.

Patented Aug. 9, 1921.

WEcark.

vwewboz Gbtowl a? UNITED STATES PATENT, OFFICE.

WALTER STARK, or AUBURN, CALIFORNIA.

DRiLL-PARALLELER.

an improved device; especially adapted for use in connection with dentalengine hand pieces which is so constructed that cavities for inlays orpin teeth forlabutments can be bored in direct parallel relation andthereby permit of the finished inlay or bridge to go easily and firmlyin place.

Another object of the invention is to pro- 'vide an improved drillattachment for den- -the drillparalleler showing the means of tal workin Which the drill, bur or the like, will be held in such a manner thatthe cav- .ity being made for bridge work orthe like cessive ones,

A further object ofthe invention is to pro? vide an improved devicewhich will effecwill be parallel: to all previous or all suctivelypermit the'bur, drill or the like to be 1 swung in a horizontal and avertical plane and still remainparallel to a cavity bored andthereby'permit of other cavities being bored in parallel-relation to thefirst cavity.

'A further object of the invention is to provide an improved device fordrillingiparallel cavities which can ,be readily and I quickly attachedto or'detached from an engine hand piece and which will allow a firmhold to be obtainedon the hand piece and ,permit the hand ,pieceto beused in'the ordinary manner.

-A further ob ect of the invention is the provision of an improved drillparalleler embodying a series of. joints all working on the same planeof action, a pair of parallel arms working in a plane at right anglestothe joints, and an anchored handle, the parallel arms carrying springmeans for detachably engaging an engine handipiece.

A still further object of: the invention is to provide an improveddrill. attachment of the above character ,which is, durable andefficient in-use, onfethat issimple and easy specificationof LettersPatent. Patented Aug, 9, 192 1,

' Application. filed May 6, 1920. Serial No. 379,416.' a i tomanufacture, and onewhich can be placed upon the market at a reasonablecost.

VV'ith these and other objects in view, the invention consists in thenovel construction, arrangement and formation of parts as will behereinafter more specifically described, claimed and illustrated in theaccompanying drawings, forming a part of this specification, in whichdrawings:

Figure 1 is a perspective view of the improved drill paralleler attachedto an engine hand piece and showing the same in operation.

Fig. 2 is a plan view of the improved drill paralleler.

. Fig. 3 is a fragmentary vertical section through the drill'parall'eler.

Fig. 4 is a detail horizontal section through connecting the anchoragehandle to the joints, and Y Fig. 5 is a fragmentary vertical sectionsimilar to Fig. 3 showing the arms arranged portion E.

The anchorage portion C comprises a cylindrical handle 10, theoutervsurface of which is serrated or milled so that a firm grip may beobtained thereon so as to pre- 1 vent the slipping of the same when inuse.

The inner end of the handle 10 is provided withv a reduced extensionllwhich is adapt- .edtobe secured to the horizontally swinging portionD. The horizontally swinging por- ;tion D includes a plurality of joints12 each of which includes upper and lower flat plates 13 and 14 whichare pivotally secured by means of vertically disposed pins 15 to solidpieces 16 which are arrangedinterme- 'diatethe upper and lower plates13'and 14. I

The upper and lower plates 13 and 14 forming the terminals of the joints12 are pivotally secured to outwardly extending solid members 17 and 18.The body 17 is provided with an inwardly extending bore 19 whichreceives the reduced extension 11 formed on the handle 10 and theextension is held against displacement on the body 17 by means of aremovable fastening element 20. The end member 18 has its outer endreduced in thickness and attached to the vertically swinging portion E.

The vertically swinging portion E comprises a pair of parallel arms 21and 22, the terminals of which are mounted on horizontal pivots 23 whichare secured in the slotted portions of pairs of upper and lower heads 24and 25. The pairs of upper and lower heads 24 and 25 are detachablyconnected together as at 26 and have outwardly extending annular flanges2'7 for a purpose which will hereinafter more fully appear.

The reduced portion of the end member 18 is provided with an openingwhich is adapted to receive the inner end of'the vertically swingingportion E and this connection permits the vertically swinging portion Eto swing in a horizontal plane on the end member 18 and the flanges 27engage the upper and lower surfaces of the end member. The outerportions of the vertically swinging portion E carries for movement in ahorizontal plane the spring clamp 28 and the annular flanges 27 carriedby the vertically swinging portion engage the upper and lower surface ofthe shank 29 formed on the spring clamp. Y p

The spring clamp 28 includes the shank 29 and the outwardly extendingsemi-circular jaws 30 which are adapted to engage around the engine handpiece B. One of the jaws 30 is provided with an inwardly extending pit31 which is adapted to engage in the ordinary oil hole formed in theenginehand piece B. x

In use of the improved device, the handle 10 is firmly held by theoperators assistant or held in the left hand of the operator while theengine hand piece is held and operated in the usual manner. If sodesired the hand may be rested lightly upon the face of the patient, sothat movement of the handle out of correct position will be prevented.After one cavity has been bored in a tooth it is merely necessary toraise the hand piece and swing the same on a horizontal pivot to thenext tooth which is to be bored. Owing to the arms 21 and 22 whichalways remain in parallel relation, when the hand piece is moveddownwardly to the bore of the next hole, the same will'be bored indirect parallel relation to the first hole bored.

From the foregoing description it can be seen that an improved device isprovided for the hand pieces of dental engines which'will effectivelypermit cavities for the pin teeth of bridge abutment to be bored indirect parallel relation to each other.

' Changes in details may be made without departing from the spirit orscope of the invention, but, 1

I claim:

1. A device for drilling holes in parallel relation comprising ananchorage portion, a plurality. of horizontally swinging joints carriedby the anchorage portion, a vertically swinging portion carried bythehorizontally swinging joints, and means carried by the verticallyswinging portion for engagin a tool.

2. X tool attachment comprising an anchorage handle, a plurality ofhorizontally swinging joints, a pair of vertically swinging parallelarms carried by the horizontally swinging portions, and a horizontallyswinging clamp carried by the vertically swinging parallel arms. i

3. The combination with an engine hand piece, of'an attachment thereforcomprising an anchorage handle, a plurality of horizontally swingingjoints carried by the handle, a pair of vertically swinging parallelarms carried by the horizontally swinging portion, and a spring clampcarried by the parallel swinging arms arranged: to engage the handpiece.

4. The combinationwiththe hand a dental engine, of an attachmenttherefor including an anchorage handle, aplurality of horizontallyswinging joints, a pair of parallel armscarried by the horizontallyswinging joints and arranged formovement in a vertical plane, and meanscarried by the parallel arms formovement in a horizontal plane fordetachably engaging the hand piece of the engine.

5. The combination withthe hand piece of a dental engine, of anattachment therefor including an anchorage'handle, a plurality of jointsarranged for movement in the same plane, a pair of spaced parallel armscarried by the joints and arranged for movement in a plane at rightangles to the movement of the'joints, and a clamp movably carried by theparallel arms for detachably engaging the hand piece. 1

6. The combination with the hand piece of a dental engine, of anattachment therefor including an anchorage handle, a plurality of jointscarried by the handle and arranged for movement in the'same'plane, apair of spaced parallel arms arranged for movement in a planev at rightangles to the joints, a spring clamp carried bythe outer end of theparallel arms arranged for movement in a plane at right angles to theplane of movement of the arms, the clamp being adapted to detachablyengage the hand piece.

7. The combination with'a dental engine piece of hand piece having anoil 'hole'therein, of an attachment therefor comprising a cylindrinerhead to thejoints, the parallel arms arcal handle adapted to be engagedby one ranged to swing in-a plane at right angles to hand of theoperator, a plurality of joints the joints, a spring clamp carried bythe 10 secured to the handle and arranged for outer head and an inwardlyextending tit movement in the-same plane, pairs of spaced formed on theclamp arranged to engage in slotted heads, parallel arms pivotallysesaid oil hole.

cured to the heads, means connecting the in- WALTER STARK.

